Carol Finn¹, Paul Bedrosian², Richard Blaine McCleskey³, JoAnn M Holloway¹, W. Steven Holbrook⁴ and Esben Auken⁵, (1)USGS, Geology, Geophysics and Geochemistry Science Center, Denver, CO, United States, (2)USGS, Geology, Geophysics, and Geochemistry Science Center, Denver, CO, United States, (3)U.S. Geological Survey, Water Mission Area, Boulder, CO, United States, (4)Virginia Polytechnic Institute and State University, Geosciences, Blacksburg, VA, United States, (5)University of Aarhus, Aarhus, Denmark